-LRB- CNN -RRB- -- Donald Sterling ca n't seem to avoid trouble over recorded phone calls .

In the latest twist to a downfall triggered by more recordings , the Los Angeles Clippers ' owner allegedly threatened to `` take out '' his wife 's lawyer and sue two doctors who declared him mentally unfit .

He made several calls to the doctors this month and left profanity-laced voice mails to intimidate them out of testifying next month , according to attorneys for his wife , Shelly Sterling .

`` I 'm not incompetent . You 're -LRB- expletive -RRB- incompetent , you stupid -LRB- expletive -RRB- doctor , '' he said in a June 9 voice mail provided by his wife 's attorneys .

` How dare you '

In the message , he identifies himself and expresses anger about the release of his medical records .

`` There 's an ethical issue here . ... How dare you give my records to a lawyer for the purpose of using it against me ? '' he demands . `` You 're nothing but a fraud and a liar and a cheat , and I 'm going to see that you lose your license , and I 'm suing you for conspiracy . ''

Sterling made the calls to two doctors , James Spar and Meril Platzer , who diagnosed him as mentally incapacitated .

Both will present their evidence in court on behalf of Shelly Sterling , who 's vying to uphold a negotiated sale of the Clippers .

Death threat ?

His wife 's attorney , Pierce O'Donnell , said Sterling targeted him as well and threatened to `` take you out . ''

`` I took that as a death threat , '' O'Donnell said . `` That has n't happened in 40 years as a trial lawyer . ''

Donald Sterling waived doctor-patient confidentiality in connection with his mental evaluation , Shelly Sterling 's attorneys said in court papers , an assertion denied by his lawyers .

She asked a judge to order her husband and his legal team to stop contacting and harassing witnesses involved in the court battle .

Los Angeles Judge Michael Levanas on Thursday rejected the wife 's request to keep her husband and his lawyers away from witnesses , saying her assertions do n't `` rise to the level of great and irreparable injury . ''

`` It is probably no surprise to anyone that this case might involve high emotions and some litigation posturing , '' the judge wrote .

Deal to sell the team

Donald Sterling 's attorneys admitted he left the voice mails , but they said he meant no harm and was just distressed that his medical records were publicized .

The two physicians who examined Donald Sterling did n't have his permission to talk to third parties , said Bobby Samini , another attorney for Donald Sterling ,

In next month 's probate court trial , Shelly Sterling will ask the court to uphold her deal to sell the team to former Microsoft CEO Steve Ballmer for $ 2 billion .

Her decision to go to probate court follows a ruling by three physicians that her 80-year-old husband is mentally incapacitated and shows early Alzheimer 's or other brain disease .

The couple co-owns the basketball team . If one of the trustees is declared mentally incapacitated , the other becomes the lone trustee , according to records . His wife used that provision to negotiate the deal with Ballmer .

NBA Commissioner Adam Silver banned Sterling for life and fined him $ 2.5 million after a different recording appeared in April in which he made a series of racist comments to a friend .

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Sterling allegedly left intimidating voice mail messages for two doctors

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He threatens to sue the two after they declared him mentally unfit

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Both will present their evidence in court on behalf of his wife , Shelly Sterling